Electric power supply system for electric train which removes fl

Details Electric power supply system for electric train which removes fl Electric power supply system for electric train which removes fl

1992-05-08

1994-09-13

Stephan, Steven L.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 79, 363 95, H02M 742

Patent

active

053474422

ABSTRACT:
An electric power supply system used in electric trains or electric buses is equipped with a device for removing ripples of low frequencies which cause flickering in a lighting system on the train or bus. The system includes an inverter for inverting DC power to AC power, a low pass filter for passing components of the AC power having low frequencies, amplitude detecting means for detecting an amplitude of an output of the filter, error detecting means for detecting any deviation of the amplitude from a reference signal, and a control system for detecting and removing flickering components from an error signal generated by the error detecting means. The control system includes a flickering component passing device for passing only flickering components contained in an output of the filter, a phase compensating device for compensating a phase lag of the flickering components, and a gain compensating device for compensating a gain of the flickering components.

REFERENCES:
patent: 3859590 (1975-01-01), Cielo et al.
patent: 4504897 (1985-03-01), Blackwood
patent: 5001619 (1991-03-01), Nakajima et al.
patent: 5115386 (1992-05-01), Shirahama et al.

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